import _ from 'lodash';
  
 if ('serviceWorker' in navigator) {
     window.addEventListener('load', () => {
       navigator.serviceWorker.register('/sw.js').then(registration => {
         console.log('SW registered: ', registration);
       }).catch(registrationError => {
         console.log('SW registration failed: ', registrationError);
       });
     });
   }

  